JP7279499B2 - temperature measuring device - Google Patents

Description

The present invention relates to a device for measuring the temperature of a rotor of a motor.

Some temperature sensors for measuring the temperature of a motor are configured as follows. A temperature sensor is installed on the inner surface of the housing of the motor. By measuring radiation heat emitted from the rotor, the temperature of the rotor is measured without contacting the rotor. As a document showing such a technique, there is the following Patent Document 1.

JP 2008-168790 A

The temperature sensor described above can measure the temperature of the rotating rotor. Based on the temperature, it is possible to determine whether or not the output of the motor is excessive. As a result, the application of excessive torque can be avoided, and the reliability of the motor can be ensured.

However, in the above technique, the rotor rotates relative to the temperature sensor, so the temperature sensor cannot always measure the temperature of the same portion of the rotor. Therefore, it is difficult to accurately measure the temperature of the rotor and to accurately grasp the tendency of the temperature change of the rotor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a main object of the present invention is to enable accurate acquisition of the temperature of the rotor and the tendency of the temperature change of the rotor.

A temperature measuring device of the present invention measures the temperature of a rotor of a motor having a rotor and a stator. The rotor is rotatable around a predetermined axis and has permanent magnets attached thereto. The stator is fitted with coils. The motor causes the rotor to generate torque about the axis through the cooperation of the permanent magnets and the coils.

The temperature measuring device has a temperature sensor, a transmitter, and a receiver. The temperature sensor is fixed to the rotor or a rotating body that rotates therewith, and measures the temperature of a predetermined portion of the rotor. The transmitter is fixed to the rotor or a rotating body that rotates therewith, acquires temperature information, which is information about the temperature, from the temperature sensor, and transmits the temperature information to the outside of the rotor. The receiving unit is installed outside the rotor without rotating with the rotor, and receives the temperature information transmitted by the transmitting unit.

According to the present invention, the temperature sensor is fixed to the rotor or a rotating body that rotates therewith, so that it does not rotate relative to the rotor. Therefore, even if the rotor rotates, the temperature sensor can accurately measure the temperature of the rotor. Furthermore, since the temperature sensor always measures the temperature of the same portion of the rotor, it is possible to accurately grasp the tendency of the temperature change of the rotor, compared to the case where the measurement location of the rotor changes. Then, the temperature information can be taken out of the rotor by transmitting the temperature information to the reception section outside the rotor by the transmission section. Based on the temperature information, the motor can be accurately controlled.

Schematic diagram showing a temperature measuring device and its surroundings in the first embodiment Cross-sectional view of tires, motors, etc. viewed in the direction of travel of the vehicle Cross-sectional view of tires, motors, etc. viewed axially outward Axial sectional view of the rim, temperature sensor and valve member A graph showing the relationship between each position and temperature on the rotor Sectional view of tires, a motor, etc. viewed axially outward in the second embodiment. Sectional view showing a propeller, a motor, etc. in the third embodiment

Next, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments, and can be modified as appropriate without departing from the gist of the invention.

[First embodiment]
FIG. 1 is a schematic diagram showing a temperature measuring device of this embodiment and its surroundings. A vehicle 90 has a body 91 , four tires 60 and two motors 20 . The two motors 20 are in-wheel motors installed inside the front left and right tires 60 and drive the corresponding tires 60 independently of the other three tires 60 . In this embodiment, each tire 60 is a normal pneumatic tire.

Further, the vehicle 90 has a control unit 10 that controls the motor 20 , a tire pressure monitoring system 70 (TPMS) that monitors the air pressure of the tires 60 , and a temperature measuring device 80 that measures the temperature of the motor 20 . The tire pressure monitoring system 70 has an air pressure sensor 72 , a transmitter 73 , a receiver 76 and a display 77 . The transmitter 73 and receiver 76 also constitute a part of the temperature measuring device 80 . The temperature measuring device 80 has a temperature sensor 82 and an estimating section 87 in addition to the transmitting section 73 and the receiving section 76 .

FIG. 2 is a cross-sectional view of the front right tire 60 shown in FIG. 1 and the wheel 50 and the motor 20 on the inner peripheral side thereof, viewed in the traveling direction of the vehicle 90 . A wheel 50 is installed on the inner peripheral side of the tire 60 . Wheel 50 has a disc portion 52 and a rim portion 56 .

The rim portion 56 is a cylindrical member and is installed on the inner peripheral side of the tire 60 . A disc portion 52 is provided on the inner peripheral side of the rim portion 56 . The disk portion 52 includes a hub portion 53 that is externally fitted and fixed to the shaft portion 41 described later, and a plurality of spoke portions that extend radially from the hub portion 53 and connect the hub portion 53 and the rim portion 56 . 54.

Motor 20 has a stator 30 and a rotor 40 . The stator 30 has a cylindrical support portion 33 . The rotor 40 has a shaft portion 41 , a supported portion 42 , a connection portion 43 and an outer rotor portion 45 .

The shaft portion 41 is installed rotatably around its own axis line X on the inner peripheral side of the support portion 33 . The supported portion 42 is a cylindrical portion whose inner diameter is substantially equal to the outer diameter of the shaft portion 41 and whose outer diameter is slightly smaller than the inner diameter of the support portion 33 , and is fitted and fixed to the shaft portion 41 . . A bearing 23 is interposed between the outer peripheral surface of the supported portion 42 and the inner peripheral surface of the support portion 33 . Thereby, the supported portion 42 is rotatably supported by the support portion 33 via the bearing 23 . Each member constituting the rotor 40 , that is, the shaft portion 41 , the supported portion 42 , the connection portion 43 and the outer rotor portion 45 rotate about the axis X integrally with the wheel 50 and the tire 60 .

The outer rotor portion 45 is a cylindrical portion whose inner diameter is slightly larger than the outer diameter of the support portion 33 and is fitted onto the support portion 33 with a gap therebetween. The connecting portion 43 is a disk-shaped portion that connects the axially outward Db end of the supported portion 42 and the axially outward Db end of the outer rotor portion 45 , and is fixed to the disk portion 52 . there is

FIG. 3 is a cross-sectional view taken along line III--III shown in FIG. 2, that is, a cross-sectional view of the tire 60, wheel 50, motor 20, etc. viewed from the axial direction outward Db. A plurality of permanent magnets 44 are provided on the inner peripheral edge of the outer rotor portion 45 at intervals in the circumferential direction. A coil 34 is installed on the outer peripheral edge of the support portion 33 . The permanent magnet 44 and the coil 34 work together to generate torque around the axis X in the rotor 40, and the rotor 40, wheel 50, and tire 60 rotate together.

Description will be made with reference to FIG. 2 again. Tire pressure monitoring system 70 has a valve member 74 . The valve member 74 has the air valve 71, and the air pressure sensor 72 and transmitter 73 described above. A valve member 74 is secured to the rim portion 56 . Thus, valve member 74 rotates with tire 60 , wheel 50 and rotor 40 .

The air valve 71 is installed so as to protrude axially outward Db from inside the tire 60 , and is configured to allow air to be sucked into the tire 60 . The air pressure sensor 72 and the transmitter 73 are installed on the outer peripheral surface of the rim portion 56 , that is, inside the tire 60 . The air pressure sensor 72 measures the air pressure of the tire 60 and transmits air pressure information iP, which is information about the air pressure, to the transmitter 73 . The transmitter 73 wirelessly transmits the air pressure information iP to the outside of the rotating parts including the rotor 40 , the wheels 50 and the tires 60 .

The air pressure information iP may be information indicating whether the air pressure is higher than a predetermined value, that is, information indicating whether the air pressure is normal, or information indicating the air pressure itself. If the information indicates the air pressure itself, the receiving side determines whether or not the air pressure is normal.

The temperature measuring device 80 has the above-described temperature sensor 82 and transmitter 73, and a communication line 83 connecting them. The temperature sensor 82 is mounted on the inner peripheral surface of the rim portion 56 at a position facing the outer peripheral surface of the outer rotor portion 45 . The temperature sensor 82 measures radiant heat (that is, infrared rays) radiated from the outer rotor portion 45 . Therefore, the temperature sensor 82 is a non-contact sensor that measures the temperature of the outer rotor portion 45 without contacting the outer rotor portion 45 .

The method of attaching the temperature sensor 82 to the inner peripheral surface of the rim portion 56 includes mechanical attachment such as screwing with a screw or engagement with an engaging member, attachment with a band, adhesion, bonding, embedding, attachment with a magnet, and the like. exemplify adsorption, combinations thereof.

A communication line 83 communicably connects the temperature sensor 82 and the transmission section 73 . The communication line 83 is connected to the transmitter 73 by passing through the inside of the valve member 74 from the temperature sensor 82 side without penetrating the rim portion 56 in the radial direction of the tire 60 . The temperature sensor 82 transmits temperature information iT, which is information about the acquired temperature, to the transmitter 73 via the communication line 83 . The transmitter 73 wirelessly transmits the temperature information iT to the outside of the rotating parts including the rotor 40 , the wheel 50 and the tire 60 .

Next, the installation position of the temperature sensor 82 will be described. Hereinafter, the lengthwise direction of the axis X will be referred to as the "axial direction". Further, the direction toward the vehicle body 91 in the axial direction is defined as "axial direction inner side Da", and the opposite direction is defined as "axial direction outer direction Db". Further, the axial range from the axially inner Da end face 52a of the disc portion 52 to the axially inner Da end 60a at the contact portion between the tire 60 and the rim portion 56 is defined as a "first range R1". .

In the axial direction (Da, Db), the temperature sensor 82 is preferably arranged so that at least part of it falls within the first range R1. This is because the outer rotor portion 45 is installed so as to extend axially inward Da from the disk portion 52 . Therefore, if the length of the axially inner Da of the outer rotor portion 45 is short, the axially inner Da end 45a of the outer rotor portion 45 is axially longer than the axially inner Da end 56a of the rim portion 56. Located on the outside Db. As a result, the inner peripheral surface of the rim portion 56 near the end 56 a on the inner side Da in the axial direction does not face the outer peripheral surface of the outer rotor portion 45 .

In this regard, if the temperature sensor 82 is arranged as described above, compared to the case where the temperature sensor 82 is arranged axially inward Da from the first range R1, even if the "outer rotor portion 45 Even if it is small inward in the direction Da, it easily faces the outer peripheral surface of the outer rotor portion 45 . Therefore, it becomes easy to correspond to the outer rotor portion 45 of each size. Further, compared to the case where the temperature sensor 82 is arranged axially inwardly Da of the first range R1, the temperature sensor 82 enters the axially outward Db from the axially inward Da opening of the wheel 50. This is because the influence of the disturbance caused by the air flowing in from the opening can be suppressed because the opening is arranged at the position.

More preferably, in the axial direction (Da, Db), the temperature sensor 82 is arranged so as to be entirely within the first range R1. This is because the above effect can be obtained more remarkably.

Below, the range on the axial direction outer side Db side in two ranges which halved the 1st range R1 in the axial direction (Da, Db) is set to "2nd range R2." More preferably, the temperature sensor 82 is arranged so that at least a portion thereof falls within the second range R2 in the axial direction (Da, Db). More preferably, in the axial direction (Da, Db), the temperature sensor 82 is arranged so that its entirety falls within the second range R2. This is because the above effects can be obtained more remarkably. Therefore, in this embodiment, the temperature sensor 82 is arranged so that the entirety of the temperature sensor 82 falls within the second range R2 in the axial direction (Da, Db).

Next, referring to FIG. 3 again, the positions and the like where the temperature is measured by the temperature sensor 82 will be described. Hereinafter, the position facing the air pressure sensor 72 in the outer rotor portion 45 is referred to as "first position p1". Further, the intersection of the imaginary straight line L connecting the first position p1 and the axis X and the end surface of the permanent magnet 44 on the outer peripheral side is defined as "second position p2". Further, the intersection of the imaginary straight line L and the end face of the permanent magnet 44 on the inner peripheral side is defined as "third position p3".

The temperature sensor 82 measures the first temperature T1, which is the temperature at the first position p1. Based on the first temperature T1, an estimation unit 87, which will be described later, estimates a second temperature T2, which is the temperature at the second position p2, and a third temperature T3, which is the temperature at the third position p3.

FIG. 4 is a cross-sectional view of the rim portion 56, the valve member 74, and the temperature sensor 82 viewed from the axially outward direction Db. Hereinafter, an imaginary straight line connecting the center of gravity of the valve member 74 and the axis X when viewed from the axial direction outward Db as shown in this figure is referred to as "valve line L1". Also, as shown in this figure, an imaginary straight line connecting the center of gravity of the temperature sensor 82 and the axis X when viewed in the axial direction outward Db is defined as "temperature sensor line L2".

The angle θ between the valve line L1 and the temperature sensor line L2 is preferably 10° or less. This is because, by locating the center of gravity of the temperature sensor 82 near the center of gravity of the valve member 74, fluctuations in the position of the center of gravity of the rim portion 56 and the like due to the installation of the temperature sensor 82 can be suppressed. Also, by arranging the temperature sensor 82 near the valve member 74 , it becomes easier to connect the temperature sensor 82 to the transmitting portion 73 of the valve member 74 . In order to obtain such effects more remarkably, the angle θ is preferably 5° or less. Therefore, in this embodiment, the angle θ is 5° or less. In FIG. 4, the temperature sensor 82 and the valve member 74 are exaggeratedly displaced in the circumferential direction in order to show the angle .theta. is smaller than that shown.

Next, referring to FIG. 1 again, the functions of the tire pressure monitoring system 70 and the temperature measuring device 80 will be described. The receiver 76 , the display 77 , the estimator 87 and the controller 10 are installed inside the vehicle body 91 . Therefore, unlike the air pressure sensor 72 , the temperature sensor 82 and the transmitter 73 , they do not rotate together with the tire 60 , wheel 50 and rotor 40 .

As described above, the air pressure sensor 72 transmits the air pressure information iP, and the temperature sensor 82 transmits the temperature information iT to the transmitter 73, respectively. Then, as described above, the transmission unit 73 wirelessly transmits the air pressure information iP and the temperature information iT to the outside of the rotating unit.

The receiver 76 receives the wirelessly transmitted air pressure information iP and temperature information iT, and transmits them to the display unit 77 and the estimation unit 87 . When the received air pressure information iP indicates an abnormality, the display unit 77 notifies the driver or the like of the fact by displaying that the air pressure of the tire 60 is abnormal.

The estimation unit 87 obtains the first temperature T1 from the temperature information iT received from the reception unit 76, and estimates the second temperature T2 and the third temperature T3 based thereon. The details of the estimation method will be described later.

The estimator 87 transmits the estimated second temperature T2 and third temperature T3 to the controller 10 . The controller 10 controls the motor 20 based on the second temperature T2 and the third temperature T3. Specifically, for example, when the second temperature T2 or the third temperature T3 is higher than a predetermined value, the output of the motor 20 is restricted.

FIG. 5 is a graph showing the temperature (T) at each portion (δ) of the outer rotor portion 45. As shown in FIG. A method of estimating the second temperature T2 and the third temperature T3 from the first temperature T1 will be described with reference to this graph.

The following two methods are conceivable. First, the estimating unit 87 has, for example, a map showing the relationship between the first temperature T1, the second temperature T2, and the third temperature T3. The second temperature T2 and the third temperature T3 may be estimated.

Secondly, the estimator 87 acquires the heat flux q in the route from the first position p1 to the third position p3 via the second position p2 in the outer rotor section 45, and calculates the heat flux q and the first temperature T1. , the second temperature T2 and the third temperature T3 may be estimated. Specifically, it is as follows.

Hereinafter, the length from the first position p1 to the second position p2 is defined as "first length δ1". Also, the length from the second position p2 to the third position p3 is defined as "second length δ2". Also, let the thermal conductivity in the section from the first position p1 to the second position p2 be “first thermal conductivity λ1”. Also, let the thermal conductivity in the section from the second position p2 to the third position p3 be “second thermal conductivity λ2”. From the heat equation, the second temperature T2 and the third temperature T3 are represented by the following Equation 1.

Here, the estimating unit 87 has the values of the first thermal conductivity λ1, the second thermal conductivity λ2, the first length δ1, and the second length δ2 as data. Therefore, if the heat flux q can be obtained, the heat flux q, the measured first temperature T1, and the above values (λ1, λ2) held as data can be converted to the upper side of Equation 1 above. 2nd temperature T2 can be calculated|required by substituting to the type|formula. Further, the heat flux q, the measured first temperature T1, and the above values (λ1, λ2, δ1, δ2) held as data are substituted into the lower equation of Equation 1 above. Thus, the third temperature T3 can be obtained.

The heat flux q can be estimated, for example, from the heat input into the motor 20 and the heat output leaving the motor 20 . The heat input can be estimated from the power consumption of the motor 20, for example. The thermal output can be estimated from, for example, copper loss, iron loss, mechanical loss, heat absorption by the cooling medium, temperature of the stator 30, residual magnetic flux density, and the like. From the estimated heat input and heat output, the second temperature T2 and the third temperature T3 can be obtained by estimating the heat flux q as described above.

According to this embodiment, the following effects are obtained. Temperature measurement device 80 can be employed for rotor 40 of motor 20 that drives tire 60 of vehicle 90 . Also, since the temperature sensor 82 is fixed to the rim portion 56 , it does not rotate relative to the outer rotor portion 45 . Therefore, the first temperature T1 can be measured with high accuracy.

In addition, the transmitter 73 , which rotates relative to the receiver 76 , wirelessly transmits the air pressure information iP and the temperature information iT to the receiver 76 . Therefore, unlike the case where the air pressure information iP and the temperature information iT are transmitted by wire, the transmission unit 73 can transmit the air pressure information iP without providing a sliding contact (brush) or the like for releasing the relative rotation in the middle of the wire. and temperature information iT can be transmitted to the receiver 76 .

In addition, since the temperature sensor 82 is attached to the rim portion 56 rather than the outer rotor portion 45 where the permanent magnet 44 is installed and is close to the coil 34 and thus tends to generate heat, the temperature of the outer rotor portion 45 is less likely to be transmitted. Therefore, the risk of damage to the temperature sensor 82 due to the temperature of the outer rotor portion 45 can be suppressed. Moreover, if the temperature sensor 82 is attached to the outer peripheral surface of the outer rotor portion 45, there is a possibility that the temperature sensor 82 may be detached from the outer peripheral surface due to centrifugal force. In that respect, since the temperature sensor 82 is attached to the inner peripheral surface of the rim portion 56, there is no concern that the temperature sensor 82 will come off to the outside due to centrifugal force.

In addition, since the temperature measurement device 80 uses the transmission unit 73 of the tire pressure monitoring system 70 to transmit the temperature information iT to the outside of the rotor 40, there is no need to have the transmission unit 73 independently, and the configuration is simple. Become. Moreover, since the temperature sensor 82 is located inside the wheel 50, it is less affected by disturbance. Furthermore, since the transmitter 73 is located inside the tire 60, it is less likely to be damaged.

Moreover, since the estimating unit 87 is provided, the temperature of the permanent magnet 44 can be estimated even when the temperature of the permanent magnet 44 is not directly measured as in the present embodiment.

[Second embodiment]
Next, a second embodiment will be described. In the following embodiments, members that are the same as or corresponding to those in the previous embodiments are denoted by the same reference numerals. This embodiment will be described based on the first embodiment, focusing on points that differ from this.

FIG. 6 is a sectional view of the tire 60 and the motor 20 viewed from the axial direction outward Db in the second embodiment. The “temperature sensor 82 ” referred to in the first embodiment is the first temperature sensor 82 in this embodiment, and a second temperature sensor for measuring the temperature of the inner peripheral surface of the outer rotor portion 45 is provided on the outer peripheral portion of the support portion 33 . A sensor 88 is provided. Like the first temperature sensor 82, the second temperature sensor 88 is also a non-contact sensor. Since the inner peripheral surface of the outer rotor portion 45 rotates relative to the second temperature sensor 88, the second temperature sensor 88 can measure the temperature of the same portion of the inner peripheral surface of the outer rotor portion 45. First, the average temperature of the entire circumference of the inner peripheral surface of the outer rotor portion 45 is measured. The second temperature sensor 88 transmits information on the measured temperature to the estimator 87 .

Estimation of the second temperature T2 by the estimation unit 87 of the present embodiment will be described with reference to FIG. 5 again. The estimating section 87 estimates the third temperature T3 based on the temperature of the inner peripheral surface of the outer rotor section 45 measured by the second temperature sensor 88 . A second temperature T2 is estimated based on the third temperature T3 and the measured first temperature T1 and the like. Details are as follows. Eliminating q from the two equations of Equation 1 above to form a single equation yields the equation of Equation 2 below.

As in the first embodiment, the estimating unit 87 in this embodiment also uses the values of the first thermal conductivity λ1, the second thermal conductivity λ2, the first length δ1, and the second length δ2 as data. have. Therefore, the second Temperature T2 can be determined.

Description will be made with reference to FIG. 6 again. It is preferable that at least some of the temperature measurement timings of the first temperature sensor 82 and the second temperature sensor 88 overlap each other. This is because the second temperature T2 can be estimated more accurately by measuring at the same timing. Although it is preferable that the second temperature sensor 88 is not shifted in the axial direction (Da, Db) with respect to the first temperature sensor 82, it can be implemented even if it is shifted in the axial direction (Da, Db).

According to this embodiment, not only the first temperature T1 is measured by the first temperature sensor 82, but also the temperature of the inner peripheral surface of the outer rotor portion 45 is measured by the second temperature sensor 88 to estimate the third temperature T3. Thus, the second temperature T2 can be estimated without using a map or estimating the heat flux q. Further, by measuring not only the first temperature T1 but also the temperature of the inner peripheral surface of the outer rotor portion 45, the temperature of the permanent magnet 44 can be estimated with higher accuracy.

[Third embodiment]
Next, a third embodiment will be described. This embodiment will be described based on the first embodiment, focusing on points that differ from this.

FIG. 7 is a cross-sectional view of the motor 20 and the like in a direction orthogonal to the axial direction (Da, Db) in the third embodiment. In this embodiment, the motor 20 is not an in-wheel motor that drives the tires 60 of the vehicle 90, but drives a propeller 69 of a manned or unmanned flying object 100 such as a helicopter or drone.

Specifically, a propeller 69 is connected to the shaft portion 41 of the motor 20 and rotates together with the rotor 40 . The rotor 40 is provided with a protruding portion 59 that protrudes outward from the outer rotor portion 45 , and the temperature sensor 82 and the transmitting portion 73 are attached to the protruding portion 59 . The temperature sensor 82 and the transmitter 73 are connected by wire so as to be communicable. The transmitter 73 wirelessly transmits the temperature information iT to a receiver outside the rotor 40 .

According to this embodiment, the temperature measuring device 80 can be implemented also for the motor 20 of the flying object 100 .

[Other embodiments]
For example, the above embodiment can be implemented by changing as follows. The transmitting section 73 may transmit each information to the receiving section 76 by wire instead of by radio. Moreover, in the first and second embodiments, the temperature measurement device 80 may have its own transmission section 73 separately from the transmission section 73 of the tire pressure monitoring system 70 .

Also, the temperature sensor 82 may be a contact sensor directly attached to the outer rotor portion 45 instead of a non-contact sensor. Further, the temperature sensor 82 may directly measure the temperature of the permanent magnet 44 instead of measuring the temperature of the portion other than the permanent magnets in the outer rotor portion 45 . Also, in the second embodiment, the second temperature sensor 88 may be a contact sensor that is directly attached to the inner peripheral portion of the outer rotor portion 45 instead of the non-contact sensor.

In addition, in the first and second embodiments, the motors 20 may be provided for the two rear tires 60 instead of the two front tires 60, or the four motors 20 may be provided for the four rear tires 60. It may be provided for the tire 60 . Further, in the first and second embodiments, the tire 60 may be a non-pneumatic tire, and the air pressure sensor 72 and the display section 77 may be omitted.

Further, in the third embodiment, the flying object 100 may be an unmanned aircraft having wings, a manned aircraft, or the like, instead of a drone or the like. The propeller 69 may drive the flying object 100 forward.

DESCRIPTION OF SYMBOLS 20... Motor 30... Stator 34... Coil 40... Rotor 44... Permanent magnet 56... Rim 59... Protruding part 73... Transmitter 76... Receiving part 80... Temperature measuring device 82... Temperature sensor , iT... temperature information, p1... first position, T1... first temperature, X... axis line.

Claims (11)

It has a rotor (40) rotatably provided around a predetermined axis (X) and having a permanent magnet (44) installed thereon, and a stator (30) having a coil (34) installed thereon. A temperature measurement device (80) for measuring the temperature of the rotor of a motor (20) that generates torque around the axis in the rotor by the cooperation of the magnet and the coil,
a temperature sensor (82) fixed to the rotor or a rotating body (56, 59) that rotates therewith and measuring a temperature (T1) of a predetermined portion (p1) of the rotor;
a transmitter (73) fixed to the rotor or a rotating body that rotates therewith, acquires temperature information (iT) that is information about the temperature from the temperature sensor, and transmits the temperature information (iT) to the outside of the rotor;
a receiving unit (76) installed outside the rotor without rotating with the rotor and receiving the temperature information transmitted by the transmitting unit;
has
The rotor has an outer rotor portion (45) provided on the outer peripheral side of the outer peripheral surface of the stator,
The permanent magnet is installed in the outer rotor section,
The temperature sensor is fixed at a position facing the outer peripheral surface of the outer rotor portion, and is a non-contact temperature sensor that measures the temperature of the outer peripheral surface of the outer rotor portion without contacting the outer peripheral surface. Temperature measuring device. The motor is an in-wheel motor that is provided on the inner peripheral side of a tire (60) of a vehicle (90) and rotates the tire,
The rotor rotates integrally with the tire and its wheel (50),
The temperature sensor is installed on the inner peripheral surface of the wheel,
The temperature measuring device according to claim 1 . The wheel has a cylindrical rim portion (56) and a disk portion (52) provided on the inner peripheral side of the rim portion,
The longitudinal direction of the axis is defined as the axial direction, the direction toward the vehicle body (91) side in the axial direction is defined as axially inward (Da), and the direction opposite to the axially inward direction is defined as axially outward (Db ), and the axial range from the axially inner end surface (52a) of the disk portion to the axially inner end (60a) at the contact portion between the tire and the rim portion is defined as a first range (R1) as
3. The temperature measuring device according to claim 2 , wherein said temperature sensor is arranged such that at least a portion of said temperature sensor falls within said first range in said axial direction. The second range (R2) is the range on the outer side in the axial direction of the two ranges obtained by dividing the first range into two equal parts in the axial direction,
4. The temperature measuring device according to claim 3 , wherein said temperature sensor is arranged so that at least a portion of said temperature sensor falls within said second range in said axial direction. said vehicle having a tire pressure monitoring system (70) for monitoring the pressure of said tires, said transmitter being part of said tire pressure monitoring system;
The transmission unit transmits air pressure information (iP), which is information about the air pressure, and the temperature information to the outside of the rotor.
A temperature measuring device according to any one of claims 2 to 4 . The tire pressure monitoring system has an air valve (71) for drawing air into the tire, an air pressure sensor (72) for measuring the air pressure of the tire, and a valve member (74) having the transmitter. ,
A virtual straight line (L1) connecting the center of gravity of the valve member and the axial line, and a virtual straight line (L2) connecting the center of gravity of the temperature sensor and the axial line, viewed in the axial direction, which is the longitudinal direction of the axial line. 6. The temperature measuring device according to claim 5 , wherein the angle ([theta]) is 10[deg.] or less. The temperature measuring device according to claim 1 , wherein the motor is a motor for rotating a propeller (69) of an aircraft (100). The temperature sensor measures a temperature (T1) of a portion of the rotor other than the permanent magnet,
An estimator ( 87 ) for estimating the temperature (T2, T3) of the permanent magnet based on the temperature of a portion other than the permanent magnet measured by the temperature sensor. A temperature measuring device as described. It has a rotor (40) rotatably provided around a predetermined axis (X) and having a permanent magnet (44) installed thereon, and a stator (30) having a coil (34) installed thereon. A temperature measurement device (80) for measuring the temperature of the rotor of a motor (20) that generates torque around the axis in the rotor by the cooperation of the magnet and the coil,
a temperature sensor (82) fixed to the rotor or a rotating body (56, 59) that rotates therewith and measuring a temperature (T1) of a predetermined portion (p1) of the rotor;
a transmission unit (73) fixed to the rotor or a rotating body that rotates therewith, acquires temperature information (iT), which is information about the temperature, from the temperature sensor, and transmits the temperature information (iT) to the outside of the rotor;
a receiving unit (76) installed outside the rotor without rotating with the rotor and receiving the temperature information transmitted by the transmitting unit;
has
The temperature sensor measures a temperature (T1) of a portion of the rotor other than the permanent magnet,
A temperature measuring device, comprising an estimator (87) for estimating temperatures (T2, T3) of the permanent magnets based on temperatures of portions other than the permanent magnets measured by the temperature sensor. A first temperature sensor (82) as the temperature sensor that measures the temperature (T1) of the outer peripheral surface of the rotor, and a second temperature sensor (88) that measures the temperature of the inner peripheral surface of the rotor. death,
10. The temperature measuring device according to claim 8 , wherein the estimator estimates the temperature (T2, T3) of the permanent magnet based on the temperatures measured by the first temperature sensor and the second temperature sensor. . The temperature measurement device according to any one of claims 1 to 10 , wherein the transmission section transmits the temperature information wirelessly.

Images